Shinya:
I assume by "blemished skin" you mean acne. Glycolic peels can be a somewhat useful adjunct therapy, but not the whole answer. look into antibiotics, oral or topical, as well as retinoic acid and similar products. Don't rely entireley on esthetic treatments.
It takes some time and effort, but you can get a lot of help.
And don't pick or squeeze your blemishes!
Best.
Dr. R